| /* |
| * soc-util.c -- ALSA SoC Audio Layer utility functions |
| * |
| * Copyright 2009 Wolfson Microelectronics PLC. |
| * |
| * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| * Liam Girdwood <lrg@slimlogic.co.uk> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <linux/platform_device.h> |
| #include <linux/export.h> |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| |
| int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) |
| { |
| return sample_size * channels * tdm_slots; |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size); |
| |
| int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params) |
| { |
| int sample_size; |
| |
| sample_size = snd_pcm_format_width(params_format(params)); |
| if (sample_size < 0) |
| return sample_size; |
| |
| return snd_soc_calc_frame_size(sample_size, params_channels(params), |
| 1); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size); |
| |
| int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots) |
| { |
| return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots); |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_calc_bclk); |
| |
| int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params) |
| { |
| int ret; |
| |
| ret = snd_soc_params_to_frame_size(params); |
| |
| if (ret > 0) |
| return ret * params_rate(params); |
| else |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk); |
| |
| static const struct snd_pcm_hardware dummy_dma_hardware = { |
| /* Random values to keep userspace happy when checking constraints */ |
| .info = SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER, |
| .buffer_bytes_max = 128*1024, |
| .period_bytes_min = PAGE_SIZE, |
| .period_bytes_max = PAGE_SIZE*2, |
| .periods_min = 2, |
| .periods_max = 128, |
| }; |
| |
| static int dummy_dma_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| |
| /* BE's dont need dummy params */ |
| if (!rtd->dai_link->no_pcm) |
| snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); |
| |
| return 0; |
| } |
| |
| static const struct snd_pcm_ops dummy_dma_ops = { |
| .open = dummy_dma_open, |
| .ioctl = snd_pcm_lib_ioctl, |
| }; |
| |
| static struct snd_soc_platform_driver dummy_platform = { |
| .ops = &dummy_dma_ops, |
| }; |
| |
| static struct snd_soc_codec_driver dummy_codec; |
| |
| #define STUB_RATES SNDRV_PCM_RATE_8000_192000 |
| #define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ |
| SNDRV_PCM_FMTBIT_U8 | \ |
| SNDRV_PCM_FMTBIT_S16_LE | \ |
| SNDRV_PCM_FMTBIT_U16_LE | \ |
| SNDRV_PCM_FMTBIT_S24_LE | \ |
| SNDRV_PCM_FMTBIT_U24_LE | \ |
| SNDRV_PCM_FMTBIT_S32_LE | \ |
| SNDRV_PCM_FMTBIT_U32_LE | \ |
| SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) |
| /* |
| * The dummy CODEC is only meant to be used in situations where there is no |
| * actual hardware. |
| * |
| * If there is actual hardware even if it does not have a control bus |
| * the hardware will still have constraints like supported samplerates, etc. |
| * which should be modelled. And the data flow graph also should be modelled |
| * using DAPM. |
| */ |
| static struct snd_soc_dai_driver dummy_dai = { |
| .name = "snd-soc-dummy-dai", |
| .playback = { |
| .stream_name = "Playback", |
| .channels_min = 1, |
| .channels_max = 384, |
| .rates = STUB_RATES, |
| .formats = STUB_FORMATS, |
| }, |
| .capture = { |
| .stream_name = "Capture", |
| .channels_min = 1, |
| .channels_max = 384, |
| .rates = STUB_RATES, |
| .formats = STUB_FORMATS, |
| }, |
| }; |
| |
| int snd_soc_dai_is_dummy(struct snd_soc_dai *dai) |
| { |
| if (dai->driver == &dummy_dai) |
| return 1; |
| return 0; |
| } |
| |
| static int snd_soc_dummy_probe(struct platform_device *pdev) |
| { |
| int ret; |
| |
| memset(&dummy_codec, 0, |
| sizeof(struct snd_soc_codec_driver)); |
| |
| ret = snd_soc_register_codec(&pdev->dev, &dummy_codec, &dummy_dai, 1); |
| if (ret < 0) |
| return ret; |
| |
| ret = snd_soc_register_platform(&pdev->dev, &dummy_platform); |
| if (ret < 0) { |
| snd_soc_unregister_codec(&pdev->dev); |
| return ret; |
| } |
| |
| return ret; |
| } |
| |
| static int snd_soc_dummy_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_platform(&pdev->dev); |
| snd_soc_unregister_codec(&pdev->dev); |
| |
| return 0; |
| } |
| |
| static struct platform_driver soc_dummy_driver = { |
| .driver = { |
| .name = "snd-soc-dummy", |
| }, |
| .probe = snd_soc_dummy_probe, |
| .remove = snd_soc_dummy_remove, |
| }; |
| |
| static struct platform_device *soc_dummy_dev; |
| |
| int __init snd_soc_util_init(void) |
| { |
| int ret; |
| |
| soc_dummy_dev = |
| platform_device_register_simple("snd-soc-dummy", -1, NULL, 0); |
| if (IS_ERR(soc_dummy_dev)) |
| return PTR_ERR(soc_dummy_dev); |
| |
| ret = platform_driver_register(&soc_dummy_driver); |
| if (ret != 0) |
| platform_device_unregister(soc_dummy_dev); |
| |
| return ret; |
| } |
| |
| void __exit snd_soc_util_exit(void) |
| { |
| platform_device_unregister(soc_dummy_dev); |
| platform_driver_unregister(&soc_dummy_driver); |
| } |